import sys

#
# str = sys.stdin.readline()
# print(str)
#
# num = input("请输入第一个数字")
# print(num)
#
# sys.stdout.write("hello")
# print('world')

file = open('a.txt', 'r', encoding='utf-8', buffering=1)
print(file.read())
file.close()

with open('a.txt', 'r', encoding='utf-8', buffering=1) as file2:
    print(file2.readlines())  # 返回一个列表对象

with open('a.txt', 'w', encoding='utf-8', buffering=1) as file3:  # 覆盖
    file3.write('hello world')

with open('a.txt', 'a', encoding='utf-8', buffering=1) as file4:  # 追加
    file4.write('31414heaui')
